Note 11 - Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cost of revenues	$ (10,106)	$ (7,951)	$ (6,953)
Research and development	(52,843)	(47,755)	(40,385)
Sales and marketing	12,363	12,161	12,572
General and administrative	(11,841)	(10,354)	(10,488)
Total, before income taxe	1,367	1,303	18,899
Taxes on income (Note 14)	1,339	729	1,871
Net income	28	574	17,028
Financial income, net (Note 13)	3,291	3,418	3,026
Reclassification out of Accumulated Other Comprehensive Income [Member]
Net income	252	(373)	169
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Cost of revenues	5	(7)	4
Research and development	272	(308)	162
Sales and marketing	8	(13)	10
General and administrative	22	(26)	13
Total, before income taxe	307	(354)	189
Taxes on income (Note 14)	36	(42)	21
Net income	271	(312)	168
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Available-for-sale Marketable Securities [Member]
Taxes on income (Note 14)	(9)	(6)	(1)
Net income	(19)	(61)	1
Financial income, net (Note 13)	$ (28)	$ (67)